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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
import { log } from "./log";
const debugEnvVariable = (typeof process !== "undefined" && process.env && process.env.DEBUG) || undefined;
let enabledString;
let enabledNamespaces = [];
let skippedNamespaces = [];
const debuggers = [];
if (debugEnvVariable) {
enable(debugEnvVariable);
}
const debugObj = Object.assign((namespace) => {
return createDebugger(namespace);
}, {
enable,
enabled,
disable,
log,
});
function enable(namespaces) {
enabledString = namespaces;
enabledNamespaces = [];
skippedNamespaces = [];
const wildcard = /\*/g;
const namespaceList = namespaces.split(",").map((ns) => ns.trim().replace(wildcard, ".*?"));
for (const ns of namespaceList) {
if (ns.startsWith("-")) {
skippedNamespaces.push(new RegExp(`^${ns.substr(1)}$`));
}
else {
enabledNamespaces.push(new RegExp(`^${ns}$`));
}
}
for (const instance of debuggers) {
instance.enabled = enabled(instance.namespace);
}
}
function enabled(namespace) {
if (namespace.endsWith("*")) {
return true;
}
for (const skipped of skippedNamespaces) {
if (skipped.test(namespace)) {
return false;
}
}
for (const enabledNamespace of enabledNamespaces) {
if (enabledNamespace.test(namespace)) {
return true;
}
}
return false;
}
function disable() {
const result = enabledString || "";
enable("");
return result;
}
function createDebugger(namespace) {
const newDebugger = Object.assign(debug, {
enabled: enabled(namespace),
destroy,
log: debugObj.log,
namespace,
extend,
});
function debug(...args) {
if (!newDebugger.enabled) {
return;
}
if (args.length > 0) {
args[0] = `${namespace} ${args[0]}`;
}
newDebugger.log(...args);
}
debuggers.push(newDebugger);
return newDebugger;
}
function destroy() {
const index = debuggers.indexOf(this);
if (index >= 0) {
debuggers.splice(index, 1);
return true;
}
return false;
}
function extend(namespace) {
const newDebugger = createDebugger(`${this.namespace}:${namespace}`);
newDebugger.log = this.log;
return newDebugger;
}
export default debugObj;
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